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A recent member of the "Useful Brotherhood", he acts as a willing guinea pig for Hubris's concoctions. It's unclear whether or not he was part of the staff or a patient within the Exile Clinic. There's small evidence that he may have been a patient, for he exhibits small signs of mental madness. However this could just be an effect of Hubris's brainwashing.

Useful Brother is shown as a young man who's a bit not right in the head. However he seems harmless and dimwitted, claiming to have made a bunch of merchandise for the "Useful Brotherhood" such as T-shirts, stickers, and hats. He is also seen as devoted, for despite everything Hubris has done to him, Useful remains loyal to him.

It can be assumed he wears a long-sleeved shirt under his assigned blue-orange cowl and hat. Under his hood, he possesses dark and disheveled medium-length hair. Along with his green pants, he wears very slender boots. He has been given a golden mask to wear, concealing part of his face. In his initial appearance, Useful Brother had an unnatural blue skin tone due to the dropping temperature of his body. When cured from the freezing ice ant serum, his actual skin tone is revealed to be very light. A distinguishing little trait of Useful Brother are his pupils, which appear very small to symbolize his "loose screws".

This surgery seems threatening at first glance(in the 3rd game you can even hear the pitter patter of the many ants from outside of Useful.) However if you keep a calm head you can pass it in a breeze. Use the lighter to melt the various frostbite then use the car battery to kill the ants. Try to be quick but accurate(in AS3 missing while frostbite is present may stun Ophelia, rendering you unable to use your tools for a few seconds), then after they are all dead extract them all from Useful's body. You'll have to deal with the ice ants for one more region. Do the same as before, along with mending the star-shaped scar.

Keep note that the ice ants will occasionally create more frostbite.

Currently Chad Burnem is able to clear an entire area of ice ants in AS4. This can come in handy for Sudden Death.

There's a peculiar grammatical difference in one of Useful's lines in Amateur Surgeon 4. In the original Amateur Surgeon 3, Ophelia tells the Brother that he won't be so useful if he dies of hypothermia, to which he replies, "Wait, what???". For some reason, this line was slightly changed in AS4, where instead he replies with "Wait, wait???".

Inside the last operating area, there are tiny cuts on Useful's lower back muscle, which form a star symbol. Muta-Brother wears the same symbol, located on his small intestine. It can be assumed to be a symbol of initiation for the Useful Brotherhood cult.

If you take a look at one of Useful Brother's poses (more specifically, the pose where he is trying to shake off the ice ants), his very last tooth at the top seems detached from his mouth. This is either an undesired visual error or an intentional detail for comedic effect.

There's evidence that there was going to be another part of the Brother's surgery in Amateur Surgeon 3 besides just clearing ice ants. It appears there was going to be a part where the player would have to make an incision into the Brother's neck to cure burst arteries, possibly alongside even more ice ants.